[질문] if가정법공식다섯개알려주세요~과거,과거완료,현재,미래,미래완료요또뜻이무엇에반대?

현재;If＋주어＋동사원형~,주어＋will/shall/can/may＋동사원형...과거;If＋주어＋과거동사 ~,주어＋would/should/could/might＋동사원형...